Automation System
A disadvantage of Numerical Control (NC) is:

the tape and tape reader are not reliable
the computer is not reliable
the machine tool can easily overheat
None of these
one operator is needed for each machine.

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Automation System
Speech recognition:

will be used in more applications as the technology matures.
All of these
None of these
will never be used in industrial controls
is already widely used in industrial controls

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